EXCERPT page containing first few paragraphs. 2020-04-08 18:17:58
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MTF can be measured from a real lens, or computed from a lens design. Nearly all other brands but Zeiss use computed MTF which therefore means the graphs are fantasy graphs assuming perfect (impossible) actual lenses. Long experience with a lot of Leica M glass shows that real lenses rarely if ever are fully symmetric across the field, nor do they perform as well as computed charts suggest.
The supplied MTF charts are so good, that "reference lens" is the best way to say it*. Taken images confirm stunning performance fully consistent with the MTF charts. In my experience few if any lenses in this range could match this performance.
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